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• What is a logical operator?

什么逻辑算子

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• Consider using parentheses to improve readability and avoid mistakes because of logical operator precedence.

考虑使用括号改善可读性避免由于逻辑操作符优先级导致错误

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• A logical operator that consists of a logical and followed by a logical NOT and returns a false value only if both operands are true.

逻辑其后逻辑组成的逻辑运算符如果两个运算都是真，则返回便假。

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• The logical operators have lower precedence than the individual comparison operators, which makes sense because the comparison has to be evaluated before the logical operator can be evaluated.

逻辑运算优先级低于单独比较运算符，一点意义重大，因为必须计算比较运算符，然后才能计算逻辑运算符。

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• It's best to read such execution plans from the left-lowest operator in the tree, since the logical flow in the plan is from bottom to top and left to right.

因为执行计划中的逻辑自下而上、，所以此类执行计划时，最好是从左下方的操作符开始。

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• If you use the logical | | operator, Perl will use the first true value it comes across, in order, from left to right.

如果使用逻辑| |操作符Perl就会使用后面的第一顺序取值。

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• This is the normal logical or are used to; it's just a function, not an operator.

常用or 逻辑函数而不是操作符

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• The next step is to choose the logical and or or operator and a second parameter.

下一步选择逻辑ANDOR操作符第二个参数。

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• The result of the logical negation operator!

逻辑否定运算符结果

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• The result of the logical negation operator!

逻辑否定运算符结果

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